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If \( \sum_{k=1}^{n}\left(\sum_{m=1}^{k} m^{2}\right)=a n^{4}+b n^{3}+c n^{2}+d n+e \), then
(A) \( a=\frac{1}{12} \)
(B) \( b=\frac{1}{6} \)
(C) \( d=\frac{1}{4} \)
(D) \( e=0 \)
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